De Quervain’s Tenosynovitis

De Quervain's Tenosynovitis is the swelling of 2 tendons near the wrist that attach to the base of the thumb. The swelling causes the sheaths (casings) covering the tendons to become inflamed. This then places pressure on neighbouring nerves causing pain and numbness. You may also feel pain radiating up your forearm and a catching or snapping sensation with the movement of the thumb.